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http://galeracluster.com/documentation-webpages/mysqlwsrepoptions.html#wsrep-cluster-address

Warning: Never use an empty gcomm:// string in the my.cnf configuration file. If a node restarts, that will cause the node to not join back to the cluster that it was part of, rather it will initialize a new one node cluster and cause a split brain. To bootstrap a cluster, you should only pass the --wsrep-new-cluster string, (instead of using --wsrep-cluster-address="gcomm://") on the command line.

tasks/install_galera.yml
name: check if mtab exists
name: create mtab if not exists

what are they for?